A pressure relief method for rockburst prevention and control of surrounding rock on the side wall of shaft

Abstract

The invention relates to a method for preventing and controlling rockburst of surrounding rock on the side wall of a vertical shaft, and belongs to the field of underground mining. Delineate the high-stress area of ​​the surrounding rock of the shaft as the drilling pressure relief area; arrange large-diameter pressure relief drill holes in series from top to bottom in the relief area. In the stress-concentrated rockburst risk area of ​​the surrounding rock mass of the vertical shaft, a down-the-hole drilling rig is used to construct a large-diameter pressure-relief drill hole in advance. The stress concentration degree of the rock mass in the surrounding certain stress area is reduced or the high stress is transferred to the depth of the surrounding rock mass, so as to realize the purpose of relieving the local rock mass. The invention adopts the down-the-hole drilling rig to drill a pressure-relief hole with a large diameter and depth, a large protection area, and simultaneously blocks the transmission of horizontal stress and vertical stress. It has the advantages of simple process, small engineering quantity, and good pressure-relieving effect. It is suitable for the prevention and control of medium to weak rockbursts in underground mines and deep high-stress vertical shafts of underground engineering.

Description

Technical field [0001] The present invention relates to a method of explosion pressure reduction in rock rock rock rock rock, in particular, involving a underground mine, underground engineering finishing pressure control method, belonging to underground mining, underground engineering technology. Background technique [0002] As the mine entered the deep mining stage, the depth of the construction of Lai (also known as a shaft) increased, and the difficulty of changing is getting bigger and bigger. The original rock stress and its structural stress are significantly increased, and the risk of medlar burst in the chiseling process has increased dramatically. The harmfulness of Yijing Rock is very harmful, severely threatened, equipment safety, affects wellbore engineering progress. The wellbore has a small work surface, and there is no escape hedging area. Once the rock burst will be seriously injured. How to reduce or eliminate the rock burst of rock burst from surrounding rock ...

AI Technical Summary

Problems solved by technology

Its disadvantage is that pressure relief holes are arranged along the shaft wall every 1-2 excavation footage along the periphery of the shaft, shallow holes (holes) are used for rock drilling, the drilling diameter and depth are small, and the width of the formed protection zone is small (5× cos30°=4.33m), the range of pressure relief is limited, and shallow holes are used for pressure relief, so it is difficult to achieve effective advanced pressure relief, and the occurrence of rockburst disasters cannot be avoided

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